Rationally defensible
Else clues• Based on sound reason
• Can be defended
• Can be maintained
• Capable of being held
• Defensible
• Easily argued
• Easily defended
• Easily defensible
• Hard to dispute, as a theory
• Having a solid premise
• Having some merit
• Like a good argument
• Like a good debater's arguments
• Like a solid argument
• Like a well-armed fort
• Like a well-grounded argument
• Like good arguments
• Like some defensive positions
• Like some positions
• Logical
• Not bad, as an argument
• Not easily debunked
• Possible to defend
• Solidly based
• Some positions
• Sound
• Valid
• Viable
• Well-based
• Well-founded